Air duct



C. W, FAWCETT l /fyl/NTOE: Planes NFAwcfr-f;

AIR DUCT Filed April 9, 1957 7... ffl/4,-

f PatentedJuiy 193s UNITED STATES P-T'EN T GFI-"ICEv lclaim.

My invention relates to a new and useful improvement in air ducts, andhas for its object to vprovide a simple, inexpensive, and highlysatisfactory medium for attaching' `together the plaster board membersof the air duct so that a continuous duct is provided through which acolumn of air may flow from one point to another. Such air ducts areusually rectangular in cross-section, and may consist of two, three, 10or four walls of plaster board, the lother wall or walls being formed bythe partition wall or the ceiling of the building in which the air ductis located. My invention is equally applicable where plaster board 1semployed in any or all such walls. v Another object is to provide asimple means -ior securing the air duct to the wail or ceiling Where theWallor ceiling, or both, comprise one or more of 'the walls o the duct.By my ar rangement a lightweight air duct structurels formed, and onewhich can be easily and eco. nomicaily constructed.

Fig. l is a perspective view of a length of T iron with saw cuts thereinat the bending points, fromV which I form my joining member.

l Fig. 2 is a perspective view of a length of T iron bent to form ajoining member.

Fig. 3 is a. side elevation of a length of air duct. partly in section,with my improved joining members in place.'

Fig. 4 is a cross-sectional view through an air duct, taken on linell-l, Fig. 3, lookingdn the directional the arrows. l

5 is an enlarged fragmentary detailed View, partly in section, taken onthe line .fio-Fig. 3, looking in the direction of the arrows.

Fig. 6 is a rcrom-sectional view taken through an air duct where two ofthe walls thereof are plaster board, one is a side or partition wall andone is the ceiling Vof the building, two methods oi securing the airduct to the wall and ceiling being illustrated. l

In the drawing. the air duct A is shown in con` venticnal form and mayconsist of a passagway formed oi four sides of plaster board, asillustrated in Fig. 3,7or it may be formed of two sides'ot plaster boardwiththe B servlng as one side 'of said way and a .partition .wail C asanother side. Also. there could f 'formed by either the ceiling or the"partition wall.

such v m 1- :v lMy inventionV particularly relates to the manli ner ofjoining togetherand supporting the plasbe three sides of plaster boardand one side arrangement being well understood in theV ter boards attheir ends. `I preferably employ a material known as gypsum-boards,which are universally sold in commercial practice. I have designatedthese gypsum boards by the letter D in the drawing. These gypsum boardsare .of any usual lengths such as are marketed commercially, and theyare adapted vto have plastering normally applied thereto.

In Fig. 1 I show a length of T iron i, in the web member 2 of which Ihave placed saw cuts 3 which extend through said member to the ilangemember 4. "I'hese cutsv 3 are placed at the point where the T iron I isto be bent. In Fig. 2 I have shown the T iron i in bent VAposition toillustrate how the web member 2 appears after the bending operation iscompleted. The web sections i serve as division members between the endsof the gypsum boards D. In these web sections i I provide perforations 5to re` ceive nails t, which have enlarged heads l. for a purpose to'bedescribed.

In the structure illustrated in Fig. 3 the gypsum boards D have asurface adapted to receive plas- L ter which adheres tenaciouslythereto. T'hese gypsum Aboards are of suitable lengths and are cutstraight across at their ends. en the gypsum boards are to be assembledto form an air duct unit such as is illustrated in Fig. il,` the top andbottom boards extend across the side boards 'so that nails 8 may bedriven through the top and bottom boards into the edges oi the sideboards, and thereby hold said structure thus formed in a compact,rectangular form. The ends of the4 gypsum boards D .are then passed overthe Bange member I and abut against the web member 2.V The nails 6 arethen inserted through the perforations 5 in the web members 2 and may bedriven through said perforations suilcientlif to cause the heads 1 ofsaid nails 8 to gouge through the surface ofthe vgypsum lboards D. By.this means a gripping action on the boards D is obtained by the nailsThis action is clearly shown in the enlarged detail` view of 5.

' The nails 6 are shown in Fig.'3 with heads 'l alternating along theweb member 2 with the,

points offsaid nails so as to force the wall niem-l bers D into closecontact with the flange l and Y web 2 of the joining member E. l

Any appropriate means for supporting the duct shown in Fig. 3 may beemployed, auch as rope or chain hangers or brackets. IV have illustratedtwo methods ofsupport in Fig. 6. In the upper. or ceiIingstruotureQB-Ihave employed an anchor 9 placed-in said `ain-aanzet Il on the join# 55ing member E,k and a bolt orscrew H adapted to secure an upper corner ofthe duct A to said ceiling. At the lower right-hand side of said drawingin Fig. 6 I haveillustrated a plug I2 adapted to be placed in thepartition wall C and appropriately secured to the duct A by wire loopsI3.

The T iron supporting member E is highly effective for the purpose forwhich I employ it, and

reducesthe cost of constructing air ducts of this type considerably,both in labor and material. When plastered these air ducts present apleasing appearance and are very emcient in operation.

I claim: j l A joint for an air duct, formed of individual wall members,comprising a' joining metal member of the shape having a web and a angemember, said flange memberv supporting the lends of said individual wallmembers and which ends abut against the web members, said web memberbeing perforated to receive nails each having 'a head and a point forholding said wall members in contact with said web and flange members,said nails being passed through said perforations with heads and pointsalternating about said joint, said web members being cut transversely atintervals so said ange members can be bent at said cut portions.

CHARLES W. FAWCE'II'.

